Not unusual at all.
You may have an ability for several aspects of your aerobic system to improve easily.
And may be eating right without too much deficit for the body to do so.
Your rate of improvement for that is likely about to change though, so never fear, it's not going to keep dropping that much, and not that fast.
You may get into the mid-40's eventually, unless genetically gifted in that way then maybe sooner.
Keep an eye on that morning RHR, note it. If you see it starting to go back up - too much running probably or other reasons for poor recovery.
Then again an injury is sometimes the body's way of saying it needs a rest it didn't get.
I always preferred controlled rests rather than those type shoved on me for who knows how long.
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